/*
 * Copyright 2002-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using Spring.Util;

namespace Spring.Aop.Support;

/// <summary>
/// Pointcut that looks for a specific attribute being present on a class or
/// method.
/// </summary>
/// <author>Juergen Hoeller</author>
/// <author>Mark Pollack (.NET)</author>
[Serializable]
public class AttributeMatchingPointcut : IPointcut
{
    private readonly ITypeFilter typeFilter;
    private readonly IMethodMatcher methodMatcher;

    /// <summary>
    /// Initializes a new instance of the <see cref="AttributeMatchingPointcut"/> class for the
    /// given attribute type.
    /// </summary>
    /// <param name="attributeType">Type of the attribute to look for at the class level.</param>
    public AttributeMatchingPointcut(Type attributeType)
    {
        ValidateAttributeTypeArgument(attributeType);
        this.typeFilter = new AttributeTypeFilter(attributeType);
        this.methodMatcher = TrueMethodMatcher.True;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="AttributeMatchingPointcut"/> class for the
    /// given attribute type
    /// </summary>
    /// <param name="attributeType">Type of the attribute.</param>
    /// <param name="checkInherited">if set to <c>true</c> [check inherited].</param>
    public AttributeMatchingPointcut(Type attributeType, bool checkInherited)
    {
        ValidateAttributeTypeArgument(attributeType);
        this.typeFilter = new AttributeTypeFilter(attributeType, checkInherited);
        this.methodMatcher = TrueMethodMatcher.True;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="AttributeMatchingPointcut"/> class for the given
    /// attribute type
    /// </summary>
    /// <param name="classAttributeType">The attribute type to look for at the class level.</param>
    /// <param name="methodAttributeType">The attribute type to look for at the method attribute.</param>
    public AttributeMatchingPointcut(Type classAttributeType, Type methodAttributeType)
    {
        AssertUtils.IsTrue(classAttributeType != null || methodAttributeType != null,
            "Either Type attribute type or Method attribute type needs to be specified (or both)");

        if (classAttributeType != null)
        {
            this.typeFilter = new AttributeTypeFilter(classAttributeType);
        }
        else
        {
            this.typeFilter = TrueTypeFilter.True;
        }

        if (methodAttributeType != null)
        {
            this.methodMatcher = new AttributeMethodMatcher(methodAttributeType);
        }
        else
        {
            this.methodMatcher = TrueMethodMatcher.True;
        }
    }

    /// <summary>
    /// The <see cref="Spring.Aop.ITypeFilter"/> for this pointcut.
    /// </summary>
    /// <value>The current <see cref="Spring.Aop.ITypeFilter"/>.</value>
    public ITypeFilter TypeFilter
    {
        get { return this.typeFilter; }
    }

    /// <summary>
    /// The <see cref="Spring.Aop.IMethodMatcher"/> for this pointcut.
    /// </summary>
    /// <value>The current <see cref="Spring.Aop.IMethodMatcher"/>.</value>
    public IMethodMatcher MethodMatcher
    {
        get { return this.methodMatcher; }
    }

    private static void ValidateAttributeTypeArgument(Type attributeType)
    {
        AssertUtils.ArgumentNotNull(attributeType, "attributeType");
        if (!typeof(Attribute).IsAssignableFrom(attributeType))
        {
            throw new ArgumentException(
                string.Format(
                    "The [{0}] Type must be derived from the [System.Attribute] class.",
                    attributeType));
        }
    }
}
